Key attachment



E. TILLERT. I

KEY ATTACHMENT. APPLICATION FILED FEB. 24, 1921- PatentedSepfi. 27,1921;

UNITED STATES PATENT OFFICE EDWARD TILLERT, 0F BACINE, WISCONSIN.

KEY ATTACHMENT.

useful Improvements in and I do hereby declare that the following is afull, clear, and exact description thereof.

y invention relates to an attachment for keys.

The object of my means adapted to be a key, whereby the within its lock.

A further provide means carried by invention isto provide secured to thestem of same will be retalned the lock by the insertion of a second key,or the like, from the outside.

A ,furt or object is to provide means adapted to be detachabl secured tothe stem of a key in such a predetermined posltlon that the key bit,when in the lock, wlll prevent tampering with the latter from theoutside.

In the drawings Figural is a side view of a key provided with my.improvement connected thereto, same being shown in sectional view andtaken along the linel-1 of Fig. 2.

Fig. 2 is a vertical sectional view along the line 2-2 of Fig. l, and

ig. 8 is a sectional view on the line 3-3 of Fig. 1.

Referring to the drawings in detail, the letter A designates a key, isinserted through the key-hole B and into the lock body C, the latterbeing conventionally shown in the several views of the rawings.

The stem of the key rigidly'secured thereto a member 1, formed ofsuitable material and resembling somewh y referring to Fig. 2, it willbe seen that the member 1 if detachably connected to the key A, issecured to the same by receiving the between its upper legs .2, whichare to such a degree that th resilient Specification of Letters Patent.Application filed February 24, 1921.

the bit of which 1 key stem.

Serial N 0. 447,520.

The lower legs 4 and 5, of the member 1, are provided with axiallyalined openings 6 and 7, respectively, the latter opening 7 beingsomewhat smaller in diameter than the openingG.

Slidably mounted and 7, is a bolt or the like 8, the which ends of hereduced section of the bolt 8 is shghtly section for the insertion of acoiled sprin 9 between the outside of the leg 5 and the head of thebolt, the purpose of which is to hold the bolt in its normal or lookingposition, which will be described hereinafter.

Slidably mounted upon the bolt 8, when in a position hereinafter to beexplained, is a key-holding plate 10, the purpose of which is such thatthe same may b The p ate 10 is provided in its central portion withlongated slot 11, one end of wh1ch term1nates into an enlargement, the

portion of the bolt 8 will pass therethrough,

within the lock, and turned 10 is brought into position to be insertedwithin the keyhole. ,The bolt 8 is then moved against the tension of thespring 9 which causes the slot 11 of the plate 10 td Patented Sept. 27,1921.

within the openings 6 rough the openlngs 6 and'T, the

greater in length than the enlarged more fully bear upon the reducedportion of the bolt. When this occurs, the plate may then be moved in anare upon the bolt and inserted Within the keyhole, after which the plateis moved forward until the enlarged portion of the slot falls Within thepath of movement of the spring urged bolt 8. When the two are inalinement, the bolt moves forward and locks the plate in its extendeposition.

When the parts are in the position hereinabove described, it will beapparent that it will be impossible to turn the key bit Within the lock,thus preventing the insertion of a second key Within the look from theother side, or the forcing of the locked key out.

In order to remove the plate 10 from the keyhole, the operator depressesthe bolt 8, thus permitting the plate 10 to drop upon the reducedportion of the bolt. Then by grasping the finger projection 13, theplate is swung up to permit the projection 12 to pass through thekeyhole, and then Withdrawn, after which the key is turned until its bitis in position to be Withdrawn from the lock.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention Will be apparent tothose skilled in the art, wi-thout further description, and it Will beunderstood that various changes in the size, shape, proportion, andminor details of construc tion may be resorted to Without departing fromthe spirit or sacrificing any of the ad vantages of the invention.

Having thus fully described my invention, What I claim as new, anddesire to secure by Letters Patent, is 2- r 1. A key attachment of thecharacter described, comprising a member, a key holding element securedto said member, and movable means forming said connection which permitsthe free movement of the holding element in one position and holding thesame against movement in another position.

2. A key attachment of the character described, comprising a member, akey holding element secured to said member, and spring-controlled meansforming said connection which permitsthe free movement of the holdingelement in one position and holding the same against movement in anotherposition.

. 3, A key attachment of the character described, comprising a member, akey holding element adapted to fit Within a keyhole and secured to saidmember by a movable member, a spring for controlling the latter,

said movable member permitting the free movement otthe holding elementin one position and locking the same against movement in anotherposition.

i. A key attachment of the character described, comprising a member,axspringcontrolled bolt slidable Within said member and having a reducedportion, a key-hol ing element movable upon said bolt. and adapted tofit Within a keyhole and said element being locked against movement inits extended position by the normal position of the said bolt and freeto move upon the movement of the bolt against the tension of saidcontrolling means.

In testimony that I claim the foregoing I havehereunto set my hand atRacine, 1n the county of Racine and State of Wisconsin. EDWARD TILLER-T.

